Apparatus for feeding fine fuel.



J. A. WBLTQN. APPARATUS FOR FEEDING FINE FUEL.

APPLICATION FILED MAYZQ. 1911.

Patented Apr 9, 1912;

Illlll W/TAESSE [reference beingliad "to' the accompanying J'OHN A. WELTON, OF

' APPARATUS ron FEEDING rmn FUEL.

Specification of Letters Patent. 'A puatmn filed May 29, 1911. Ser iai, No. 30,693.

dANAL DOVER, omo;

Patented Apr. 9, 1912.

To qzz'tbhomizmayaaacm:

Be it known that I, Jo: l'1i- A; WEI/iron, a' citizen of the United States, residing at Canal Dover, county of Tuscaravvas, and State of Ohio, have inventedcertain new and useful Iiiiproveinents in A 'paratus for Feeding Fine Fuel, of'whicht e following is such a full, clear, and exact description as will enable other's skilled in theart to I which it pertains to make and-usethe same,

drawings,v forming part of; this "specification.

My iriveiitiori rlalts to certain new and useful improvements in a paratus-for feed in'g pulverized fuel. into. the fire-box: of a steam boiler or furnace under pressure, said fire-box having built into 'it' anarch of brick or other refractory material, and saidar'oh. being hollow to form a 'fiue or' passage 7 adapted to heat. air a's it passes into the fire box from a fan casing conne'ct'ed'to the arch whereb the' heated air is u'tilized to' sup.- portand aid combustion; I v

An object of the present invention is'to enable me,- if necessary, to do away entirely with the grate-bar's in common use, and to garch to be heated dr thrdugfi the twyrto'" blow up the pilot fire, or to bothplace's at lessfire inthe' rear oftli arch."

make it possible to blow up a ilot. fire on the top of a twyer at will to eat ,up'the' arch and prepare for the introduction of coal dust and air to bebiirndin suspen sion'. froinapilotfireldf dense-ma ,It is, further, an objector the. resent Ve'nt'ion to inject coal dust and aii" into the fireboxthrmigli tubs expanded in the deaf sheet forthatpur' ose, the sainebeing'surrounded with we er for the purpose of keeping themes 0e61, v; 1 w

I also propose to control the directionfand volume" of theflow of air eithefthrou'gh the once if desired; it is this a bility to 'contrlol absolutely'the heated air that inakes it possible to produce a'neco'nor'nical and'srnoke- I also propose to'arrange the exhaust from a steam turbine which is used in my invention '50. that the ,exhsiust'will bedscomposed in the hollow arch and burned.

f It islthe' new and novel arrangemefitof the arch walls in co'rhblna'tion witlifih lining,

coal dust through the end wall of the fire- ;box door sheet, and the decomposition and burning of the exhaust steam from the1tur-.-

ibi'ne, and blowing air through the hollow that produces my new and useful results.

.fireman is enabled to maintain the fire by hand-firing, While the coal damper; in the hopper is closed. In fire-boxes that-are stay-bolted, or in fire-boxes of small die the twyer and the manner of introducing 'arch and heating and delivering it topthefire-box of the boile'r'under damper control:

.60 Bythe employment of the pilot fire'the ameter it may not be necessary to insulate iagainst theheat. Under conditions where,

lit is notffoiindto be advantageous the exjhaust be discharged up'the stack.

invention consists ofthe parts, andtheconstructions and arrangements and combinations or parts which I will hereinafter describe and claim. I

.part of thisspe'cification an 1 h mi ew eese 1 111 W 1.0 s1m1- With the above and other objects invie w is]; reference characters indicate like parts inthe several views, Figure 1 1s a 'long1tu 1' rial sectional view of a corrugated fire-box, v locomotive type, boile gg embodying my n -f ventlon. Fig. 2 1s a cross sectlonalvlew en thelin X--X of Fig 1.sh'owii1g parts-i broken away, A r V Imam drawings; 2; represents a coriiii. 1' gated fire-box of any suitable typelwithin which is-cons'tructed anafch, A, which declinesdownwardly toward the rear end and forms a rearwardly' converging ,chamb'er into which the fine fuel is discharged,,said' archbeing constructed witha'n internal flue or passage, 3, througi which air may, be passed and heated so, as to be-delivered in the upper front portion oithe fire-boil there to mingle withthe products of combustion I passing over the upper front end of the arch. -Piercin'gthe outer shell of the furnace and the corrugated wall of the fire-box and suitably'expanded in'place are the tubes, 4, 4", which tubes connect with the discharge pipe of the'rota'ry fan orblower, E, said discharge 'ipe of the fan casing being provided wit dampen 5, having 'a rod by a which it maybe operated to wholly or pair tially close the as age through which the air passes from the blower. It will be understood that this damper may be placed at any point between the fan or blower and i the corrugated wall of the fire-box, it only being necessary that it should be so placed as to control the passage ofair through the tubes, 4. A-similar damper'controls the passage of air through the tube, 4. The fan casing has its discharge pipe, 7, 'connecting with the tubes, 4,'4 asshown in ,Fig. 2 and the latter tube, 4']; connects with a twyer 42,-which is'horizontall placed in the lower'portion of the fire-box eneath the hollow arch and discharges upwardly to blow a pilot fire. of coarse coal and to assist in maintaining the fine fuel in suspension while being'burned, said twyer extending maintained in a state of fromthe rear end of the arch outwardly through the front of the fire-box and the wall of the fire-box casing, and having its ;outer end provided with acap or closure, 13, which when opened permits the twyer,-

42, to be cleaned of fine ashes or other contained. foreign material. It will thus be seen that I depend upon the cross'or adversev currents of air in thefire-box, one being injected, with the fueland the other.

' provided with a pipe, 9, through which the exhaust is conducted to the hollow arch to be decomposedand burned. The turbine has a suitable case, 10,, andthe rotary fan or blower has an appropriate case, 11, while the fire-box isfashionedwith an ate fire door openin 12. j

Suitable tubes,: 1 fixed to a head correspondin to the one shown in Fig. 2, of my aforesai prior patent, are expanded through the door sheet and have their inner ends positioned for injecting fine fuel charged with air'into the fire-box and into the spacebelow the arch thereof and under which arch the fuelis burned in suspension. The fuel is delivered. from a suitable fan or blower, F, which fan is shown in Fig. 1 as including a casing having a discharge'pipe, 15, connecting with the tubes, 14;' the fan has suitable blades, 18, which deliver the fine fuelunder' pressure through the discharge pipe, 15, one side of the fan casing being open and communicatin with a cylinder, 17, in which operate muller wheelsor om the latter blowing termined point.

flPP P a and 28 is, a suitable hanger for carrying or other pulverizing agents, 16, each of which is designed to operate within a chamber or cell substantially in the manner and for the purpose indicated in my aforesaid prior patent.

The fan, F, and the rotary blower, E, and

also the steam turbine, C, if desired, are mounted upon a shaft, 41, which passes through a bearing, 20,;and thence through the cylinder, 17, containing the pulverizing agent, as the muller Wheel, 16, theopposite end or portion of the shaft, 41, being mounted in any suitable and well known manner; when operated the fan blades, 18, force the pulverized fuel through the discharge,15., and the tubes, 14, into the tire box abovete twyer, 42, as before described; and air from the rotary blower is delivered through the pipe, 4, into the twyer, 42, for purposes stated, it being understood that the fanfor feeding the fine fuel, as also the rotary blower, may be provided with such accessories as are usually found in machines of this character.

By reference to Fig. 1, it will be seen that the corrugated'fire-box is provided with a lining,-2l, composed offire-brick or other refractory insulating material, which, is designed for the purpose of insulatin the firethe exbox from the imurious action 0 treme heat, said fire-box being inclosed by the shell or casing, 22, having the usual head, 23. I The inner end of thecorru ated fire-box is also 'rovided with a head, 24, forming a flue s eet and said fire-boxw'ill be provided with a suit-able outlet for the products of combustion. The pressure regulator, 25, is designed to automatically con- .trol. the speed of the turbine, C, according to the variations of the boiler pressure, and it acts to increase the revolution of the tu'rbine as the pressure drops below a prede- At the the fireman to manually vary the speed of the turbine independently of the regulator to take care of a temporary overload.

27 represents the steam dome of the boiler,

mountingthe turbine. The rear end of the fire-box is also provided with a suitable man-hole, 29, to give access to the interior of the fire-box for repairing the tube sheet or other parts and the front end of the firebox has a. fire-brick lining, 30.

By reference to Fig. 2 itwillbe seen that the damper, 5, controls the amount of air delivered to the hollow arch, andthe damper, 5, controls the air delivered through the tube, 4", to the twyer, 42, which twyer is provided with numerous perforations.

The upper front end of the flue or passage in the arch ispartially closed by bricks, a, having openings adapted to distribute the air across the entire width of the fire-box, while slanting sides are provided in the firepoint, 26, will be located a suitablethrottle which will enable.

brick as shown at 38, uponwhich rests the the fires and crush and liver under pressure the ne fuel according of the variations of theboiler pressure. It

-I claim as new and .ters Patent 1s:

box by meansoflarge specially designed hollow .ar'ch in such manner that there is formed a V-shaped receptacle or chamber in which is built a pilot fire.

1It will be understood that the fan case, E, may be suspended by suitable brackets, 39,

40, and that the shaft, 41, may beoperated by the steam'turbine or by any other form of motor, either electric, or internal conibustion' or otherwise, such motor being de signed to furnish the motive power to blow ulverize and dewill be further understood thatTthetwyer, 42, isjn the present instance substituted for the grate bars of the'former patent but the twyer can be successfully used with grate bars, if desired, without departing from the spirit of the invention.

Having thus described my invention what desire to secure by Let- 1.' In a mechanism for feeding fine fuel,

the combination with a fire-box, of'an arch within the same having, a flue, or, passage extending through it, a twyer 1n the lower part of the fire-box below said arch and dis charging upwardly and adaptedto blow a pilot fire of coarse coal and to'jmairitain the fine fuel in suspension while beingburned,

- 2. Ina fuel feeding an air blower connecting with the twyer,

j and fuel feeding elements adapted to inject passage through the arch, valves between the air feeding means and said twyer and arch. whereby the admission of air to the twyer andarch may be regulated, and means for feeding fine fuel into the space between i the twyers andarch whereby the fuel is burned in suspension under the arch;

3. In a mechanism for feeding fine fuel, the combination with-a fire-box, of an arch built therein and inclining upwardly from the rear toward the front end, anupwardly directing twyer in the lower part of the fire box below the arch acting to maintain the fuel in suspension while being burned, means for admitting air under pressure to the twyer, said arch having a flue or passage throughit opening into the fire-box near the upper front end, means for'admitting air to said passage, means for controlling-the ad'- mission of air to the twyer, and passagein the arch, and means for injecting fine fueland air through the front end of the fire-- box whereby the fuel is burnedin suspensionunder the arch, said twyer adapted to blow a pilotfire of coarse coal-over which firethe injected fine fuel is burned.

.4. In a mechanism'for feeding fine .fuel

the combination with a fire-box, of an arch built therein and inclining upwardly frbm the rear toward the front end, an upwardly directing twyer in the lower part of the fire-box below the archactin to maintain the fuelin suspension While eing burned,

means for admittir'lg1 air under pressure to the twyer, said arch aving a flue or'passage through it opening into the fire-box near the up er front end,.means for admitting air 'to sai passage, means for controlling ,the admission of air tothe twyer and passage in the arch, and means for injecting fine fuel and air through the front end of the firebox whereby the fuel is'lbu'rned in suspension under the arch, said 'twyeradapted to blow a pilot fire of coarse coal over which firethe injected fine fuel is burned, said fire-boxhaving aninternal lining of refractory material.

5. Thelcombination with a fire-box of an arch built within the same and inclining upwardly from the rear to the front end said arch having an airpassage through it open ing into the upper along the lower portion of the fire-box below the arch and piercing the front end of the fire-box, and havingfa closure'for the outer end affording-access to the interior of the twyer, and means forsupplying air' under'pressureto the twyer, said twyer discharging upwardly and adapted to blow ront endof'th'efire-box, of an upwardly directing twyer extending a pilot fire of coarse fuel and maintain fine fuel 1n suspensionwhile being burned, and

means 'forfeedin'g fine fuel above. the twyer .and into the space between saidtwyer and arch whereby the fuel is-burned suspension under the arch'and the products of combustion are mixed with air delivered through-the arch near the upper front end of the same.

6. In a mechanism for feeding fineifuel, the combination with a fire-box, and a sur face upon which a bed of fuel may be sustained, of an arch within the fire-box extending upwardly and forwardlyfrom the rear end, fuel feeding means delivering fine fuel into the space between said arch and and means for directing an air current upwardly into the path of the fine fuel 'whereby the fine fuel is burned in suspension in said space under the arch. I

'Z. The combination of afire-boxhaving an arch with a flue or passage through 'it aathe surface for sustaining the bed of fuel,

twyer in the lower part of the fire-box, and a I,

fuel feeding nieans delivering fine fuel into my own I have hereunto afiixed my signa the space under the arch and above the ture;

twyer said twyer discharging upwardly I across the path of thefeed of the fine fuel 7 H E N' 5 and thereby maintaining this fuel in sus- Witnesses:

pension below the arch while being burned. H. H. HOSTETLER,

In testimony that I claim the same to be i JOHN A. HosTETLE 

